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You can have slide film processed like normal film, left in long strips, or more commonly they are individually cut into single frames and mounted in a cardboard or plastic holder, which keeps them flat, and these mounted slides can then be put in a cartridge of a slide projector. The mounts can be seen here.

The processing is exactly the same, so no difference in quality. The mounting is done after the film is processed and dried.

cheapest of course is to have it processed without mounting and use a light table to select for mounting only those frames you want to actually display. The rest can be stored as strips in acid free paper sleeves.
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jwentingJan 26 '12 at 7:10